Goodwill and Other Intangible Assets - Other Intangible Assets Amortization Expense Table (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 1,013	$ 1,037
Accumulated amortization	(77)	(44)
Net carrying amount	936	993
Amortization expense	33	6
Offshore Platform Leases [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	33	33
Accumulated amortization	(31)	(29)
Net carrying amount	2	4
Amortization expense	2	0
Customer Contracts [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	980	1,004
Accumulated amortization	(46)	(15)
Net carrying amount	934	989
Amortization expense	$ 31	$ 6